–We can’t enter the house. I can’t find the key!–Is it possible that you ______ it in the car?
My American friend Sam is interested in Yangzhou very much. He wonders _______.
It is said that the gravity on Mars is only about __________ of the gravity on earth.
While Helen _____ along the river after supper, she ____ a wallet lying on the roadside. A. was walking; was finding B. walked; found B. walked; was finding D. was walking; found
I stopped the car ____ a short break as I was feeling tired.
______ the students were when they heard the rock music!